Language designed to deceive; empty talk; self-serving verbiage
[1900+; words as empty as an eggshell that a weasel has sucked]
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with weasel words
A word used to deprive a statement of its force or evade a direct commitment, as in Calling it “organized spontaneity” is using a weasel word; “organized” has sucked the meaning out of “spontaneity.” This idiom may allude to the weasel's habit of sucking the contents out of a bird's egg, so that only the shell remains.
[ Late 1800s